Charlie remenbered several occasions in the past--he had exp

Charlie remenbered several occasions in the past when / on which he had experienced a similar
feeling of fear.
你记住：
occasion 引导后置定语用when 引导,等于 on which
situation 引导后置定语用where引导,等于 in which
表示在.场合、情况下.
祝开心~!